# A006536 (b-file synthesized from sequence entry) 1 2 2 6 3 38 4 684 5 50224 6 13946352 7 14061131152 8 50947324188128 9 666754350781269760 10 31763991166456912086656 11 5550343429517595744902558208 12 3581353054755185129132443153728000